CN109033625A - The measuring method of the molten sunken amount of salinized soil between a kind of stake of cutting bedding bottom - Google Patents
The measuring method of the molten sunken amount of salinized soil between a kind of stake of cutting bedding bottom Download PDFInfo
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- CN109033625A CN109033625A CN201810822274.7A CN201810822274A CN109033625A CN 109033625 A CN109033625 A CN 109033625A CN 201810822274 A CN201810822274 A CN 201810822274A CN 109033625 A CN109033625 A CN 109033625A
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Abstract
The measuring method of the molten sunken amount of salinized soil can adapt to actual requirement of engineering scientifically and rationally to determine the molten sunken amount of salinized soil between the stake of immersion condition cutting bedding bottom between a kind of stake of cutting bedding bottom.Comprise steps of determining that the following immersed sinking influence depth l in cutting bedding top surface0, calculate and determine cutting bedding bottom collapsible settement calculated thickness h0；There are the molten sunken test of lotus, compression test, water ratio test, specific gravity of soil partical test and severe test to the development of salinized soil soil sample, determines i-th layer of native molten sunken index C between stakeriEtc. parameters；By following formula determine cutting bedding bottom stake between the molten sunken amount s of salinized soilr:。
Description
Technical field
The present invention relates to Geotechnical Engineering fields, in particular to the molten sunken amount of salinized soil between a kind of stake of cutting bedding bottom
Measuring method.
Technical background
Molten heavy deformation of sagging occurs under the conditions of immersion for salinized soil, easily influences high speed without tiny fragments of stone, coal, etc. railway or magnetic suspension cutting base
The normal usage function of bed.Currently, the molten sunken amount of salinized soil mostly uses " saline soil area construction standards " (SY/T 0317-2012)
It determines, instant sunken amount determines as follows:
In formula, Sδ0For total molten sunken amount of brining ground foundation, unit mm；δiFor i-th layer of native molten sunken coefficient；HiIt is i-th layer
The thickness of soil, unit mm；N is the number of plies of the whole molten sunken property salinized soil in basic bottom surface or less.
In engineering construction, because Deformation control requires cutting bedding bottom salinized soil to be reinforced frequently with pile foundation, wherein
The molten sunken amount of salinized soil is determined that existing technical deficiency is the public affairs according to above-mentioned calculation formula between the stake of cutting bedding bottom
Formula is not possible to consider inter-pile soil weight stress, cutting excavation off-load, bedding load and the influence of reinforcing pile side table constraint effect.
Summary of the invention
Technical problem to be solved by the invention is to provide the measuring and calculating of the molten sunken amount of salinized soil between a kind of stake of cutting bedding bottom
Method, scientifically and rationally to determine the molten sunken amount of salinized soil between the stake of immersion condition cutting bedding bottom, can adapt to Practical Project is needed
It wants.
It is as follows that the present invention solves technical solution used by above-mentioned technology:
The measuring method of the molten sunken amount of salinized soil between a kind of stake of cutting bedding of the invention bottom, comprising the following steps:
(1) by field investigation or data check, the following immersed sinking influence depth l in cutting bedding top surface is determined0, unit
m；Cutting bedding bottom collapsible settement calculated thickness h is determined by following formula0:
In formula, h0For cutting bedding bottom collapsible settement calculated thickness, unit m；l0It is molten to soak below cutting bedding top surface
Fall into influence depth, unit m；haFor surface layer of subgrade bed thickness, unit m；hdFor bottom layer of subgrade thickness, unit m；
(2) passing through the inspection of the scene of a crime and acquiring salinized soil soil sample and carry out indoors has the molten sunken test of lotus, compression test, moisture content
Test, specific gravity of soil partical test and severe test, determine i-th layer of native molten sunken index C between stakeri；Determine between stake i-th layer it is native initial
Void ratio e0i；Determine i-th layer of native unloading rebound index C between stakesi；Determine the effective stress changes delta σ that cutting excavation generates-,
Unit kPa；Determine i-th layer of native effective weight stress σ between stakey0i, unit kPa；fiBetween stake i-th layer soil meet it is water-soluble fall into after
The downward tangential force that reinforcing pile side table generates, unit kPa；
(3) by following formula determine cutting bedding bottom stake between the molten sunken amount s of salinized soilr:
In formula, srThe molten sunken amount of salinized soil between the stake of cutting bedding bottom, unit mm；N is collapsible settement calculated thickness range
The soil layer number of interior division；ΔsriI-th layer of native molten sunken amount, unit mm between stake；CriI-th layer of native molten sunken index between stake；Δ
ziI-th layer of native lift height between stake, unit mm；e0iI-th layer of native initial void ratio between stake；σy0iI-th layer of soil between stake
Effective weight stress, unit kPa；CsiI-th layer of native unloading rebound index between stake；Δσ-It is generated for cutting excavation effective
Stress variation, unit kPa；ΔσyiThe raw effective stress variation of i-th layer of local products, unit kPa between stake under bedding load action；
σfiI-th layer of native molten sunken restraining force between reinforcing pile imparting stake, unit kPa；χ is immeasurable Stiffness coefficient, takes 1kPa.
The invention has the advantages that considering inter-pile soil weight stress, cutting excavation off-load, bedding load and reinforcing pile
On the basis of the effect of side table constraint, the measuring method of the molten sunken amount of salinized soil between a kind of stake of cutting bedding bottom is established, is compensated for
Technical deficiency existing for existing " saline soil area construction standards " (SY/T0317-2012), measuring method is convenient, required calculating
Parameter is few, clear process, can meet actual requirement of engineering.
Detailed description of the invention
Fig. 1 is the sectional schematic diagram of cutting bedding bottom salinized soil reinforcing pile.
Component and corresponding label: surface layer of subgrade bed 1, bottom layer of subgrade 2, reinforcing pile 3, salinized soil D, bedding between stake are shown in figure
Skin depth ha, bottom layer of subgrade thickness hd, reinforcing pile stake diameter d, reinforcing pile stake distance s, the following immersed sinking shadow in cutting bedding top surface
Ring depth l0。
Specific embodiment
The present invention is further illustrated below by specific embodiment and in conjunction with attached drawing.
Referring to Fig.1, between a kind of cutting bedding bottom stake of the invention the molten sunken amount of salinized soil measuring method, including following step
It is rapid:
(1) by field investigation or data check, the following immersed sinking influence depth l in cutting bedding top surface is determined0, unit
m；Cutting bedding bottom collapsible settement calculated thickness h is determined by following formula0:
In formula, h0For cutting bedding bottom collapsible settement calculated thickness, unit m；l0It is molten to soak below cutting bedding top surface
Fall into influence depth, unit m；haFor surface layer of subgrade bed thickness, unit m；hdFor bottom layer of subgrade thickness, unit m；
(2) passing through the inspection of the scene of a crime and acquiring salinized soil soil sample and carry out indoors has the molten sunken test of lotus, compression test, moisture content
Test, specific gravity of soil partical test and severe test, determine i-th layer of native molten sunken index C between stakeri；Determine between stake i-th layer it is native initial
Void ratio e0i；Determine i-th layer of native unloading rebound index C between stakesi；Determine the effective stress changes delta σ-that cutting excavation generates,
Unit kPa；Determine i-th layer of native effective weight stress σ between stakey0i, unit kPa；fiBetween stake i-th layer soil meet it is water-soluble fall into after
The downward tangential force that reinforcing pile side table generates, unit kPa；
(3) by following formula determine cutting bedding bottom stake between the molten sunken amount s of salinized soilr:
In formula, srThe molten sunken amount of salinized soil between the stake of cutting bedding bottom, unit mm；N is collapsible settement calculated thickness range
The soil layer number of interior division；ΔsriI-th layer of native molten sunken amount, unit mm between stake；CriI-th layer of native molten sunken index between stake；Δ
ziI-th layer of native lift height between stake, unit mm；e0iI-th layer of native initial void ratio between stake；σy0iI-th layer of soil between stake
Effective weight stress, unit kPa；CsiI-th layer of native unloading rebound index between stake；Δσ-It is generated for cutting excavation effective
Stress variation, unit kPa；ΔσyiThe raw effective stress variation of i-th layer of local products, unit kPa between stake under bedding load action；
σfiI-th layer of native molten sunken restraining force between reinforcing pile imparting stake, unit kPa；χ is immeasurable Stiffness coefficient, can use 1kPa.
In the step (2), i-th layer of native molten sunken index C between stakeriTo there is soil body leaching in a certain pressure limit under the conditions of lotus
The G-bar of water-soluble sunken e-logp curve, determines as follows:
E in formulajThe void ratio generated for immersion lixiviation after the soil body compression stabilization under j-th stage pressure；pjFor j-th stage pressure；
ej+1The void ratio that immersion lixiviation generates after stablizing for soil body compression under+1 stage pressure of jth；pj+1For+1 stage pressure of jth.
In the step (2), i-th layer of native effective weight stress σ between stakey0iIt can be determined by layerwise summation method.
In step (2)~(3), i-th layer of soil is located within the scope of the collapsible settement calculated thickness of cutting bedding bottom between stake.
In step (2)~(3), reinforcing pile has acid-alkali-corrosive-resisting performance, including CFG, tubular pole, plain concrete
Stake, reinforced concrete pile；
In the step (3), reinforcing pile assigns i-th layer of native molten sunken restraining force σ between stakefi, it determines as follows:
σ in formulafiI-th layer of native molten sunken restraining force between reinforcing pile imparting stake, unit kPa；D is reinforcing pile stake diameter, unit
m；S is reinforcing pile stake spacing, unit m；Fi i-th layer of soil between stake meet generated in reinforcing pile side table after water-soluble fall into it is downward tangential
Power, unit kPa.
In the step (3), the molten sunken amount of salinized soil is cutting excavation off-load, pile foundation reinforcement and sets between the stake of cutting bedding bottom
It changes load and reloads after stabilization salinized soil collapsible settement amount between stake caused by extraneous immersion lixiviation.
In the step (3), the raw effective stress variation of i-th layer of local products be can be used between stake under bedding load action
The load share ratio of Boussinesq theoretical calculation, roadbed substrate inter-pile soil considers by 30~60%.
In the step (3), reinforcing pile equidistantly lays out pile by square, and reinforcing pile stake is long molten not less than brining ground foundation
Notch distortion calculated thickness h0。
In the step (3), the effective stress changes delta σ-that cutting excavation generates is that earth's surface is excavated to the generation of bedding bottom
Effective stress variation.
Embodiment:
Referring to Fig.1, a certain high-speed railway builds cutting bedding in salinized soil region, and cutting digs depth 6.8m (at roadbed center
Earth's surface to bedding bottom surface depth), side slope ratio be 1:1.75, bedding top surface width be 13.4m, 1 thickness 0.4m of surface layer of subgrade bed, base
2 thickness 1.9m of bed bottom.During soaking lixiviation collapsible settement can occur for the cutting bedding bottom salinized soil, in order to reduce ground
Base collapsible settement carries out basement process, reinforcing pile 3 diameter 0.5m, stake spacing 1.4m, the long 5m of stake using reinforcing pile 3.
The molten sunken amount s of salinized soil D between the stake of cutting bedding bottom when determining immersion lixiviation using the method for the present invention belowr(position
For roadbed center), the specific steps are as follows:
(1) by field investigation or data check, the following immersed sinking influence depth l in cutting bedding top surface is determined0For
4.3m；Cutting bedding bottom collapsible settement calculated thickness h is determined by following formula0:
Because of l0=4.3m > ha+hd=2.3m, therefore h0=l0-ha-hd=4.3-0.4-1.9=2.0 (m).
Accordingly, cutting bedding bottom collapsible settement calculated thickness h0Take 2.0m.
(2) passing through the inspection of the scene of a crime and acquiring salinized soil soil sample and carry out indoors has the molten sunken test of lotus, compression test, moisture content
Test, specific gravity of soil partical test and severe test, determine i-th layer of native molten sunken index C between stakeri；Determine between stake i-th layer it is native initial
Void ratio e0i；Determine i-th layer of native unloading rebound index C between stakesi；Determine the effective stress changes delta σ-that cutting excavation generates,
Unit kPa；Determine i-th layer of native effective weight stress σ between stakey0i, unit kPa；fiBetween stake i-th layer soil meet it is water-soluble fall into after
The downward tangential force that 3 side table of reinforcing pile generates, unit kPa；Cri、e0i、Csi、Δσ-、σy0i、fiDetermination the results are shown in Table 1.
(3) by following formula determine cutting bedding bottom stake between the molten sunken amount s of salinized soil Dr:
Consider in the load share ratio for calculating roadbed substrate inter-pile soil by 50%.So, i-th layer between the stake of cutting bedding bottom
The molten sunken amount Δ s of soilriDetailed calculating process be shown in Table 1.
The molten sunken amount of salinized soil D between cutting bedding bottom (roadbed center) stake:
Therefore, can must soak lixiviation when cutting bedding bottom (roadbed center) under between stake the molten sunken amount of salinized soil D be 24.8mm.
The calculating process of the molten sunken amount of i-th layer of soil between 1, table
| i | Δzi | Cri | e0i | Csi | σy0i | Δσyi | Δσ- | fi | σfi | Δsri |
| 1 | 200 | 0.019 | 0.61 | 0.011 | 130.5 | 31.3 | 128.5 | 42.3 | 33.9 | 0 |
| 2 | 200 | 0.019 | 0.61 | 0.011 | 134.4 | 31.3 | 128.5 | 42.3 | 33.9 | 1.2 |
| 3 | 200 | 0.019 | 0.61 | 0.011 | 138.4 | 31.3 | 128.5 | 42.3 | 33.9 | 2.0 |
| 4 | 200 | 0.019 | 0.61 | 0.011 | 142.4 | 31.2 | 128.5 | 42.3 | 33.9 | 2.5 |
| 5 | 200 | 0.019 | 0.61 | 0.011 | 146.3 | 31.2 | 128.5 | 42.3 | 33.9 | 2.8 |
| 6 | 200 | 0.019 | 0.61 | 0.011 | 150.3 | 31.1 | 128.5 | 42.3 | 33.9 | 3.0 |
| 7 | 200 | 0.019 | 0.61 | 0.011 | 154.2 | 30.9 | 128.5 | 42.2 | 33.9 | 3.2 |
| 8 | 200 | 0.019 | 0.61 | 0.011 | 158.2 | 30.8 | 128.5 | 42.2 | 33.8 | 3.4 |
| 9 | 200 | 0.0185 | 0.606 | 0.011 | 162.2 | 30.6 | 128.5 | 42.2 | 33.8 | 3.4 |
| 10 | 200 | 0.0175 | 0.602 | 0.011 | 166.1 | 30.4 | 128.5 | 42.2 | 33.8 | 3.3 |
The present invention is considering inter-pile soil weight stress, cutting excavation off-load, bedding load and the effect of reinforcing pile side table constraint
On the basis of, the measuring method of the molten sunken amount of salinized soil between a kind of stake of cutting bedding bottom is proposed, existing " salt marsh soil is compensated for
Area's construction standards " technical deficiency existing for (SY/T 0317-2012), scientific and reasonable, measuring method is convenient, required calculating parameter
Few, clear process can meet actual requirement of engineering, have broad popularization and application prospect.
The above is only using the measuring and calculating of the molten sunken amount of salinized soil between a kind of bottom stake of diagram illustrating cutting bedding of the invention
Some principles of method are not intended to for the present invention being confined in shown and described specific method and the scope of application, therefore all
All corresponding modifications that may be utilized and equivalent, belong to the applied the scope of the patents of the present invention.
Claims (5)
1. the measuring method of the molten sunken amount of salinized soil between a kind of stake of cutting bedding bottom, comprising the following steps:
(1) by field investigation or data check, the following immersed sinking influence depth l in cutting bedding top surface is determined0, unit m；It is logical
It crosses following formula and determines cutting bedding bottom collapsible settement calculated thickness h0:
In formula, h0For cutting bedding bottom collapsible settement calculated thickness, unit m；l0For the following immersed sinking shadow in cutting bedding top surface
Ring depth, unit m；haFor surface layer of subgrade bed thickness, unit m；hdFor bottom layer of subgrade thickness, unit m；
(2) by the inspection of the scene of a crime and acquire salinized soil soil sample carries out indoors have the molten sunken test of lotus, compression test, moisture content try
Test, specific gravity of soil partical test and severe test, determine i-th layer of native molten sunken index C between stakeri；Determine i-th layer of native initial apertures between stake
Gap ratio e0i；Determine i-th layer of native unloading rebound index C between stakesi；Determine the effective stress changes delta σ that cutting excavation generates-, single
Position kPa；Determine i-th layer of native effective weight stress σ between stakey0i, unit kPa；fiI-th layer of soil is adding after meeting water-soluble fall between stake
Gu the downward tangential force that stake side table generates, unit kPa；
(3) by following formula determine cutting bedding bottom stake between the molten sunken amount s of salinized soilr:
In formula, srThe molten sunken amount of salinized soil between the stake of cutting bedding bottom, unit mm；N is to divide within the scope of collapsible settement calculated thickness
Soil layer number；ΔsriI-th layer of native molten sunken amount, unit mm between stake；CriI-th layer of native molten sunken index between stake；ΔziFor stake
Between i-th layer of native lift height, unit mm；e0iI-th layer of native initial void ratio between stake；σy0iBetween stake i-th layer it is native effective
Weight stress, unit kPa；CsiI-th layer of native unloading rebound index between stake；Δσ-Become for the effective stress that cutting excavation generates
Change, unit kPa；ΔσyiThe raw effective stress variation of i-th layer of local products, unit kPa between stake under bedding load action；σfiTo add
Gu stake assigns i-th layer of native molten sunken restraining force between stake, unit kPa；χ is immeasurable Stiffness coefficient, takes 1kPa.
2. the measuring method of the molten sunken amount of salinized soil, feature exist between a kind of cutting bedding bottom stake according to claim 1
In: in the step (2), i-th layer of native molten sunken index C between stakeriIt is bent for soil body immersed sinking e-logp in a certain pressure limit
The G-bar of line, determines as follows:
E in formulajThe void ratio generated for immersion lixiviation after the soil body compression stabilization under j-th stage pressure；pjFor j-th stage pressure；ej+1
The void ratio that immersion lixiviation generates after stablizing for soil body compression under+1 stage pressure of jth；pj+1For+1 stage pressure of jth.
3. the measuring method of the molten sunken amount of salinized soil, feature exist between a kind of cutting bedding bottom stake according to claim 1
In: in the step (3), reinforcing pile assigns i-th layer of native molten sunken restraining force σ between stakefi, it determines as follows:
σ in formulafiI-th layer of native molten sunken restraining force between reinforcing pile imparting stake, unit kPa；D is reinforcing pile stake diameter, unit m；S is
Reinforcing pile stake spacing, unit m；fiI-th layer of soil meets the downward tangential force generated after water-soluble fall into reinforcing pile side table, unit between stake
kPa。
4. the measuring method of the molten sunken amount of salinized soil, feature exist between a kind of cutting bedding bottom stake according to claim 1
In: in the step (3), the molten sunken amount of salinized soil is cutting excavation off-load, pile foundation reinforcement and displacement lotus between the stake of cutting bedding bottom
Salinized soil collapsible settement amount between stake caused by external world's immersion lixiviation after the new load deflection of load-carrying is stablized.
5. the measuring method of the molten sunken amount of salinized soil, feature exist between a kind of cutting bedding bottom stake according to claim 1
In: in the step (3), reinforcing pile equidistantly lays out pile by square, the long molten sunken change not less than brining ground foundation of reinforcing pile stake
Shape calculated thickness h0。
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